Stream filters: Filter for message properties

[Gsantomaggio]

based on message properites. Closes: #42

[Copilot]

Pull Request Overview

This PR implements message property filtering for stream consumers in the RabbitMQ AMQP Python client. The changes add support for filtering messages based on AMQP message properties like subject and group_id.

• Added MessageProperties dataclass to define AMQP message properties for filtering
• Extended StreamFilterOptions to include message properties filtering capability
• Added comprehensive test coverage for the new filtering functionality

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_streams.py	Adds test case and message handler for message properties filtering
rabbitmq_amqp_python_client/entities.py	Implements MessageProperties dataclass and extends filtering logic
rabbitmq_amqp_python_client/init.py	Exports new MessageProperties and StreamFilterOptions classes
examples/streams_with_filters/example_streams_with_filters.py	Provides usage example combining filter values and message properties
examples/README.md	Documents the new filtering example
Makefile	Adds mypy type checking to the format target

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[Gsantomaggio]

MErged per conversation with @Zerpet